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[POWERPC] spufs: don't yield CPU in spu_yield

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There is no reason to yield the CPU in spu_yield - if the backing
thread reenters spu_run it gets added to the end of the runqueue for
it's priority.  So the yield is just a slowdown for the case where
we have higher priority contexts waiting.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Christoph Hellwig 2007-03-23 15:12:26 +01:00 committed by Paul Mackerras
parent 28066ae91b
commit dbf8eefa2b
1 changed files with 0 additions and 4 deletions
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4
arch/powerpc/platforms/cell/spufs/sched.c
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@ -438,7 +438,6 @@ void spu_deactivate(struct spu_context *ctx)
void spu_yield(struct spu_context *ctx)
{
struct spu *spu;
int need_yield = 0;
if (mutex_trylock(&ctx->state_mutex)) {
if ((spu = ctx->spu) != NULL) {
@ -447,13 +446,10 @@ void spu_yield(struct spu_context *ctx)
pr_debug("%s: yielding SPU %d NODE %d\n",
__FUNCTION__, spu->number, spu->node);
spu_deactivate(ctx);
need_yield = 1;
}
}
mutex_unlock(&ctx->state_mutex);
}
if (unlikely(need_yield))
yield();
}
int __init spu_sched_init(void)